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BrandRadiotron
ClassDuo-Diode Power Amplifier Pentode
BaseNoval
Filament6.3V @ 800mA
Construction
Primary TypeDuo-Diode Power Pentode
EnvelopeT-6-1/2
Sections3 (1 Pentode, 2 Diodes)
Filament / Heater
Heater Notesac. or dc.
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation10 W
Grid 2 Voltage250 V
Cathode Current1 mA
H-C Voltage90 V
Audio Performance
Typical THD10%
Power Output4 W
Key Features
- Miniature duo-diode power amplifier pentode
- High transconductance (10,000 µmhos)
- High power sensitivity
- Internal diodes for detector application
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier (180V) | 180V | 8000 | 130000 | - | 20mA |
| Class A1 Amplifier (250V) | 250V | 10000 | 100000 | - | 38mA |
Application Notes
The high transconductance makes the use of negative feedback highly effective. A grid stopper of 5,000 ohms is recommended to suppress parasitic oscillations. Diode on pin 6 is recommended for detection due to lower capacitance to pentode plate.
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